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/*
* V4L2 subdev interface library
*
* Copyright (C) 2010-2011 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __SUBDEV_H__
#define __SUBDEV_H__
#include <linux/v4l2-subdev.h>
struct media_entity;
/**
* @brief Open a sub-device.
* @param entity - sub-device media entity.
*
* Open the V4L2 subdev device node associated with @a entity. The file
* descriptor is stored in the media_entity structure.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_open(struct media_entity *entity);
/**
* @brief Close a sub-device.
* @param entity - sub-device media entity.
*
* Close the V4L2 subdev device node associated with the @a entity and opened by
* a previous call to v4l2_subdev_open() (either explicit or implicit).
*/
void v4l2_subdev_close(struct media_entity *entity);
/**
* @brief Retrieve the format on a pad.
* @param entity - subdev-device media entity.
* @param format - format to be filled.
* @param pad - pad number.
* @param which - identifier of the format to get.
*
* Retrieve the current format on the @a entity @a pad and store it in the
* @a format structure.
*
* @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try format stored
* in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current
* active format.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_get_format(struct media_entity *entity,
struct v4l2_mbus_framefmt *format, unsigned int pad,
enum v4l2_subdev_format_whence which);
/**
* @brief Set the format on a pad.
* @param entity - subdev-device media entity.
* @param format - format.
* @param pad - pad number.
* @param which - identifier of the format to set.
*
* Set the format on the @a entity @a pad to @a format. The driver is allowed to
* modify the requested format, in which case @a format is updated with the
* modifications.
*
* @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try format stored in the
* file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the device with an
* active format.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_set_format(struct media_entity *entity,
struct v4l2_mbus_framefmt *format, unsigned int pad,
enum v4l2_subdev_format_whence which);
/**
* @brief Retrieve a selection rectangle on a pad.
* @param entity - subdev-device media entity.
* @param r - rectangle to be filled.
* @param pad - pad number.
* @param target - selection target
* @param which - identifier of the format to get.
*
* Retrieve the @a target selection rectangle on the @a entity @a pad
* and store it in the @a rect structure.
*
* @a which is set to V4L2_SUBDEV_FORMAT_TRY to retrieve the try
* selection rectangle stored in the file handle, or
* V4L2_SUBDEV_FORMAT_ACTIVE to retrieve the current active selection
* rectangle.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_get_selection(struct media_entity *entity,
struct v4l2_rect *rect, unsigned int pad, unsigned int target,
enum v4l2_subdev_format_whence which);
/**
* @brief Set a selection rectangle on a pad.
* @param entity - subdev-device media entity.
* @param rect - crop rectangle.
* @param pad - pad number.
* @param target - selection target
* @param which - identifier of the format to set.
*
* Set the @a target selection rectangle on the @a entity @a pad to @a
* rect. The driver is allowed to modify the requested rectangle, in
* which case @a rect is updated with the modifications.
*
* @a which is set to V4L2_SUBDEV_FORMAT_TRY to set the try crop rectangle
* stored in the file handle, of V4L2_SUBDEV_FORMAT_ACTIVE to configure the
* device with an active crop rectangle.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_set_selection(struct media_entity *entity,
struct v4l2_rect *rect, unsigned int pad, unsigned int target,
enum v4l2_subdev_format_whence which);
/**
* @brief Retrieve the frame interval on a sub-device.
* @param entity - subdev-device media entity.
* @param interval - frame interval to be filled.
*
* Retrieve the current frame interval on subdev @a entity and store it in the
* @a interval structure.
*
* Frame interval retrieving is usually supported only on devices at the
* beginning of video pipelines, such as sensors.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_get_frame_interval(struct media_entity *entity,
struct v4l2_fract *interval);
/**
* @brief Set the frame interval on a sub-device.
* @param entity - subdev-device media entity.
* @param interval - frame interval.
*
* Set the frame interval on subdev @a entity to @a interval. The driver is
* allowed to modify the requested frame interval, in which case @a interval is
* updated with the modifications.
*
* Frame interval setting is usually supported only on devices at the beginning
* of video pipelines, such as sensors.
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_set_frame_interval(struct media_entity *entity,
struct v4l2_fract *interval);
/**
* @brief Parse a string and apply format, crop and frame interval settings.
* @param media - media device.
* @param p - input string
* @param endp - pointer to string p where parsing ended (return)
*
* Parse string @a p and apply format, crop and frame interval settings to a
* subdev pad specified in @a p. @a endp will be written a pointer where
* parsing of @a p ended.
*
* Format strings are separeted by commas (,).
*
* @return 0 on success, or a negative error code on failure.
*/
int v4l2_subdev_parse_setup_formats(struct media_device *media, const char *p);
/**
* @brief Convert media bus pixel code to string.
* @param code - input string
*
* Convert media bus pixel code @a code to a human-readable string.
*
* @return A pointer to a string on success, NULL on failure.
*/
const char *v4l2_subdev_pixelcode_to_string(enum v4l2_mbus_pixelcode code);
/**
* @brief Parse string to media bus pixel code.
* @param string - input string
* @param lenght - length of the string
*
* Parse human readable string @a string to an media bus pixel code.
*
* @return media bus pixelcode on success, -1 on failure.
*/
enum v4l2_mbus_pixelcode v4l2_subdev_string_to_pixelcode(const char *string,
unsigned int length);
#endif
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